So implementieren Sie das Anmeldefenster in Java

Hauptklasse des Anmeldefensters enthaltene Informationen

(Muster, Fragen)

package ccnu.paint;

import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

import ccnu.util.Answer;
import ccnu.util.Verification;

public class Login extends JFrame
{
    private static final long serialVersionUID = 1L;

    private Properties pro = new Properties();

    private boolean ver_code = false; // 默认输入验证码错误

    private Answer answer = null;

    private JPanel p1 = new JPanel(); // 添加到JPanel中的组件默认为流式布局
    private JLabel luser = new JLabel("username: ");
    private JTextField username = new JTextField(20);

    private JPanel p2 = new JPanel();
    private JLabel lpwd = new JLabel("password: ");
    private JPasswordField pwd = new JPasswordField(20);

    private JPanel p4 = new JPanel();
    private JLabel lVer = new JLabel("verification: ");
    private JTextField ver = new JTextField(10);
    private JLabel img = new JLabel();
    private JLabel result = new JLabel();

    private JPanel p3 = new JPanel();
    private JButton ok = new JButton("ok");
    private JButton cancel = new JButton("cancel");
    private JButton signUp = new JButton("Sign up"); // 用于账户注册

    // 设置组件的监听
    public void initListener()
    {
        username.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {// JTextField的action是回车键
                String name = username.getText();
                // Login.this.setTitle(name);
                // System.out.println(name.hashCode() + "***" +"".hashCode());
                if (name.equals(""))
                {
                    JOptionPane.showMessageDialog(Login.this, "Please input a userName!");
                } else
                {
                    pwd.grabFocus();
                }
            }
        });

        pwd.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e)
            {
                String password = new String(pwd.getPassword());
                if(password.equalsIgnoreCase(""))
                {
                    JOptionPane.showMessageDialog(Login.this, "please input a password!");
                }else{
                    ver.grabFocus();
                }
            }

        });

        ok.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e)
            {
                // 重新加载最新的账户文件
                try
                {
                    pro.load(new FileInputStream(new File("src/res/accouts.properties")));
                } catch (IOException e1)
                {
                    e1.printStackTrace();
                }
                check();
            }

        });

        // 判断验证码是否正确
        ver.addActionListener(new ActionListener(){
            @Override
            public void actionPerformed(ActionEvent e)
            {
                String verCode = ver.getText();
                if(verCode.equals(""))
                {
                    JOptionPane.showMessageDialog(Login.this, "Please input a verification!");
                }else{
                    if(verCode.equals(answer.getResult()))
                    {
                        result.setIcon(new ImageIcon(Login.this.getClass().getResource("/res/right.jpg"))); // 显示提示的图片信息(如√图片)
                        ver_code = true;
                        // 检查之前，重新加载最新的账户文件
                        try
                        {
                            pro.load(new FileInputStream(new File("src/res/accouts.properties"))); // 将账户文件加载进来
                        } catch (IOException e1)
                        {
                            e1.printStackTrace();
                        }
                        check();
                    }else{
                        result.setIcon(new ImageIcon(Login.this.getClass().getResource("/res/error.jpg"))); // 显示提示的图片信息(如×图片) 
                        ver_code = false;
                    }
                }
            }
        });

        // 点击图片会更改验证码
        img.addMouseListener(new MouseAdapter(){

            @Override
            public void mouseClicked(MouseEvent e)
            {
                answer = Verification.verification();
                img.setIcon(new ImageIcon(answer.getBufferedImage())); // 设置验证码图案
            }
        });

        cancel.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                int option = JOptionPane.showConfirmDialog(Login.this, "Are you sure to exit?");
//              System.out.println("option = " + option);
                if (option == 0)
                {// Yes
                    Login.this.dispose();
                }
            }
        });

        signUp.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e)
            {
                new SignUp();
            }
        });
    }

    // 初始化登录窗口及其组件的设置监听
    public Login()
    {
        super("Login");

        // 加载账户文件
        try
        {
            pro.load(new FileInputStream(new File("src/res/accouts.properties"))); // 从指定位置将账户文件加载进来
        } catch (IOException e)
        {
            e.printStackTrace();
        }

        initListener();
        answer = Verification.verification(); // 生成验证码
        img.setIcon(new ImageIcon(answer.getBufferedImage())); // 设置初始验证码

        this.setLocation(new Point(200, 200));
        this.setSize(500, 300);
        this.setLayout(new GridLayout(4, 1, 0, 20)); // 垂直间隙为20px
        p1.add(luser);
        p1.add(username);
        p2.add(lpwd);
        p2.add(pwd);
        p4.add(this.lVer);
        p4.add(this.ver);
        p4.add(this.img);
        result.setForeground(Color.red);
        result.setFont(new Font("楷体", Font.BOLD, 20));
        p4.add(result);
        p3.add(ok);
        p3.add(cancel);
        p3.add(signUp);
        this.add(p1);
        this.add(p2);
            this.add(p4);
        this.add(p3);

//      this.setBackground(Color.blue); // JFrame的上层还有一个ContentPane
        this.getContentPane().setBackground(Color.gray);
        this.setResizable(false);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 等价于Frame中的windowClosing事件
    }

    // 检查用户名或密码
    public void check()
    {

        String verCode = ver.getText();
        if(verCode.equals(""))
        {
            JOptionPane.showMessageDialog(Login.this, "Please input a verification!");
            return;
        }else{
            if(verCode.equals(answer.getResult()))
            {
                result.setIcon(new ImageIcon(Login.this.getClass().getResource("/res/right.jpg")));
                ver_code = true;
            }else{
                result.setIcon(new ImageIcon(Login.this.getClass().getResource("/res/error.jpg")));
                ver_code = false;
            }
        }

        if(ver_code == false)
        {
            JOptionPane.showMessageDialog(this, "verification is error!");
            return;
        }
        String name = username.getText();
        String password = new String(pwd.getPassword()); // return char[]
//      if (name.equalsIgnoreCase("admin") && password.equals("123456"))
        if (isPass(name, password))
        {
//          new PaintApp(name);
            JOptionPane.showMessageDialog(this, "-^_^-   OK..."); // 此处可以加上其他的登陆成功后进一步处理的窗口
            this.dispose();
        } else
        {
            JOptionPane.showMessageDialog(this, "userName or password is incorrect!");
            username.setText("");
            pwd.setText("");
            ver.setText("");
            answer = Verification.verification();
            img.setIcon(new ImageIcon(answer.getBufferedImage()));
            result.setIcon(null);
        }
    }

    // 验证用户输入的账户名和密码是否正确(通过与加载进来的账户 pro 比对)
    public boolean isPass(String name, String password)
    {
        Enumeration en = pro.propertyNames();
        while(en.hasMoreElements())
        {
            String curName = (String)en.nextElement();
//          System.out.println(curName + "---" + pro.getProperty(curName));
            if(curName.equalsIgnoreCase(name))
            {
                if(password.equalsIgnoreCase(pro.getProperty(curName)))
                {
                    return true;
                }
            }
        }
        return false;
    }

    public static void main(String[] args)
    {
        new Login();
    }
}

Die Datei Words.txt für das Problem der Erkennung chinesischer Schriftzeichen bei der Generierung des Verifizierungscodes.

Zum Beispiel: die Datei Words2.txt für das Problem der Generierung der arithmetischen Operation des Verifizierungscodes von der Schule of Political Science and Law of Handong University, Wuhan City, Hubei Province, China

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Anmeldeeffekt

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